/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
namespace FastReport.Barcode.QRCode
{
  
  /*/// <summary> This object renders a QR Code as a ByteMatrix 2D array of greyscale values.
  /// 
  /// </summary>
  /// <author>  dswitkin@google.com (Daniel Switkin)
  /// </author>
  /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
  /// </author>*/
  internal static class QRCodeWriter
  {
    
    private const int QUIET_ZONE_SIZE = 4;
    
    public static ByteMatrix encode(System.String contents, int width, int height, 
      ErrorCorrectionLevel errorCorrectionLevel, System.String encoding, bool quietZone)
    {
      if (contents == null || contents.Length == 0)
      {
        throw new System.ArgumentException("Found empty contents");
      }
      
      if (width < 0 || height < 0)
      {
        throw new System.ArgumentException("Requested dimensions are too small: " + width + 'x' + height);
      }
      
      QRCode code = new QRCode();
      Encoder.encode(contents, errorCorrectionLevel, encoding, code);
      return renderResult(code, width, height, quietZone);
    }
    
    // Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
    // 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
    private static ByteMatrix renderResult(QRCode code, int width, int height, bool quietZone)
    {
      ByteMatrix input = code.Matrix;
      int inputWidth = input.Width;
      int inputHeight = input.Height;
      int qrWidth = inputWidth + (quietZone ? QUIET_ZONE_SIZE << 1 : 0);
      int qrHeight = inputHeight + (quietZone ? QUIET_ZONE_SIZE << 1 : 0);
      int outputWidth = System.Math.Max(width, qrWidth);
      int outputHeight = System.Math.Max(height, qrHeight);
      
      int multiple = System.Math.Min(outputWidth / qrWidth, outputHeight / qrHeight);
      // Padding includes both the quiet zone and the extra white pixels to accommodate the requested
      // dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
      // If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
      // handle all the padding from 100x100 (the actual QR) up to 200x160.
      int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
      int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
      
      ByteMatrix output = new ByteMatrix(outputWidth, outputHeight);
      sbyte[][] outputArray = output.Array;
      
      // We could be tricky and use the first row in each set of multiple as the temporary storage,
      // instead of allocating this separate array.
      sbyte[] row = new sbyte[outputWidth];
      
      // 1. Write the white lines at the top
      for (int y = 0; y < topPadding; y++)
      {
        setRowColor(outputArray[y], (sbyte) SupportClass.Identity(255));
      }
      
      // 2. Expand the QR image to the multiple
      sbyte[][] inputArray = input.Array;
      for (int y = 0; y < inputHeight; y++)
      {
        // a. Write the white pixels at the left of each row
        for (int x = 0; x < leftPadding; x++)
        {
          row[x] = (sbyte) SupportClass.Identity(255);
        }
        
        // b. Write the contents of this row of the barcode
        int offset = leftPadding;
        for (int x = 0; x < inputWidth; x++)
        {
                    // Redivivus.in Java to c# Porting update - Type cased sbyte
                    // 30/01/2010 
          // sbyte value_Renamed = (inputArray[y][x] == 1)?0:(sbyte) SupportClass.Identity(255);
                    sbyte value_Renamed = (sbyte)((inputArray[y][x] == 1) ? 0 : SupportClass.Identity(255));
          for (int z = 0; z < multiple; z++)
          {
            row[offset + z] = value_Renamed;
          }
          offset += multiple;
        }
        
        // c. Write the white pixels at the right of each row
        offset = leftPadding + (inputWidth * multiple);
        for (int x = offset; x < outputWidth; x++)
        {
          row[x] = (sbyte) SupportClass.Identity(255);
        }
        
        // d. Write the completed row multiple times
        offset = topPadding + (y * multiple);
        for (int z = 0; z < multiple; z++)
        {
          Array.Copy(row, 0, outputArray[offset + z], 0, outputWidth);
        }
      }
      
      // 3. Write the white lines at the bottom
      int offset2 = topPadding + (inputHeight * multiple);
      for (int y = offset2; y < outputHeight; y++)
      {
        setRowColor(outputArray[y], (sbyte) SupportClass.Identity(255));
      }
      
      return output;
    }
    
    private static void  setRowColor(sbyte[] row, sbyte value_Renamed)
    {
      for (int x = 0; x < row.Length; x++)
      {
        row[x] = value_Renamed;
      }
    }
  }
}